i40iw: Implement get_vector_affinity API

Storage ULPs (like NVMEoF) benefit from exposing affinity mapping
per completion vector to find the optimal multi-queue affinity
assignments. The ULPs call the verbs API ib_get_vector_affinity
introduced in commit c66cd353bbe ("RDMA/core: expose affinity mappings per
completion vector") to get the underlying devices affinity mappings.

Add support in driver to expose the affinity masks per MSI-X
completion vector.

Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.c b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
index 70024e8..a517985 100644 (file)
--- a/drivers/infiniband/hw/i40iw/i40iw_verbs.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.c
@@ -2729,6 +2729,25 @@ static int i40iw_destroy_ah(struct ib_ah *ah)
 }
 
 /**
+ * i40iw_get_vector_affinity - report IRQ affinity mask
+ * @ibdev: IB device
+ * @comp_vector: completion vector index
+ */
+static const struct cpumask *i40iw_get_vector_affinity(struct ib_device *ibdev,
+                                                      int comp_vector)
+{
+       struct i40iw_device *iwdev = to_iwdev(ibdev);
+       struct i40iw_msix_vector *msix_vec;
+
+       if (iwdev->msix_shared)
+               msix_vec = &iwdev->iw_msixtbl[comp_vector];
+       else
+               msix_vec = &iwdev->iw_msixtbl[comp_vector + 1];
+
+       return irq_get_affinity_mask(msix_vec->irq);
+}
+
+/**
  * i40iw_init_rdma_device - initialization of iwarp device
  * @iwdev: iwarp device
  */
@@ -2824,6 +2843,7 @@ static struct i40iw_ib_device *i40iw_init_rdma_device(struct i40iw_device *iwdev
        iwibdev->ibdev.req_notify_cq = i40iw_req_notify_cq;
        iwibdev->ibdev.post_send = i40iw_post_send;
        iwibdev->ibdev.post_recv = i40iw_post_recv;
+       iwibdev->ibdev.get_vector_affinity = i40iw_get_vector_affinity;
 
        return iwibdev;
 }